Honolulu Air Quality in Spring
Across 2019–2025, Honolulu's spring (March–May) air quality had a median AQI of 32 (Good) over 644 monitored days in the Urban Honolulu, HI area. 0.0% of spring days (0 of 644) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 65.2% of days. The cleanest spring on record here was 2020 (median AQI 30, 0 days above 100) and the worst was 2023 (median 35, 0 days above 100, peak AQI 55).
- Good: 96.7%
- Moderate: 3.3%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How is the air in Honolulu in spring?
Good on a typical day: median AQI 32 across 2019–2025, with 0.0% of spring days above AQI 100. Ground-level ozone is the main driver.
- ✓96.7% of spring days were Good (AQI 0–50), 3.3% Moderate (51–100).
- ✓0 days of 644 reached AQI 101+; the spring peak was 62.
- ✓Cleanest month: May; worst month: March.
Frequently asked questions
What is the air quality like in Honolulu in spring?▾
Across 2019–2025, the median daily AQI in Honolulu in spring was 32 (Good). 96.7% of days were Good, 3.3% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 644 monitored days in EPA's Air Quality System.
Is spring a good time for outdoor exercise in Honolulu?▾
A typical spring day in Honolulu sits in the Good range (median AQI 32), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of spring days reached AQI 101+ in 2019–2025.
Which pollutant causes Honolulu's spring air quality problems?▾
Ground-level ozone set the daily AQI on 65.2% of spring days in Honolulu. The highest spring AQI recorded in 2019–2025 was 62 (Moderate), in 2023.
Honolulu spring air quality, year by year
Honolulu spring air quality by year (Urban Honolulu, HI, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 92 | 32 | 0 | 62 | O3 |
| 2020cleanest | 92 | 30 | 0 | 54 | O3 |
| 2021 | 92 | 31 | 0 | 47 | O3 |
| 2022 | 92 | 32 | 0 | 53 | PM2.5 |
| 2023worst | 92 | 35 | 0 | 55 | PM2.5 |
| 2024 | 92 | 34 | 0 | 54 | O3 |
| 2025 | 92 | 31 | 0 | 59 | O3 |
What spring air means in Honolulu
A typical spring day in Honolulu sits in the Good range (median AQI 32), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of spring days reached AQI 101+ in 2019–2025.
Spring's median AQI of 32 is in line with Honolulu's whole-year median of 29, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median Spring AQI across every EPA metro area (307,196 metro-days, 2019–2025) is 43, so Honolulu runs below the national Spring norm; 0.0% of its Spring days topped AQI 100 versus 0.8% nationally (about the same).
Within the season, May is the cleanest month (median AQI 30, 0.0% of days above 100) and March the worst (median 34, 0.0% above 100).
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Honolulu
The latest EPA AirNow observation puts Honolulu's AQI at 15 (PM2.5). The figures above are multi-year season statistics, not today's reading.
View current Honolulu air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Urban Honolulu, HI), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.